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AI 资讯

Probing FFmpeg's av1_vulkan encoder: does your GPU actually support it?

TL;DR FFmpeg 8.x includes av1_vulkan , the first cross-vendor GPU AV1 encoder in mainline FFmpeg. We'll probe whether your GPU + driver actually expose AV1 encode, run a first working encode, benchmark it against SVT-AV1 on your own content, and talk about which jobs deserve it. 📦 Code: github.com/USER/repo (replace before publishing) Until FFmpeg 8.0 ("Huffman", released August 2025), GPU AV1 encoding meant picking a vendor: av1_nvenc for NVIDIA RTX 40+, av1_amf for AMD, av1_qsv for Intel Arc. Three code paths, three sets of flags, three driver stacks. The Vulkan Video encode work gives FFmpeg one encoder that reaches all three vendors through the standard VK_KHR_video_encode_av1 extension. The catch: driver support is a lottery. Plenty of capable hardware sits behind drivers that don't expose the encode extension yet. So before any pipeline decisions, we probe. 1. Check what you're running You want FFmpeg 8.x (8.1.2 is current as of late June 2026) built with Vulkan support, plus the vulkaninfo tool from the Vulkan SDK / vulkan-tools package. $ ffmpeg -version | head -1 ffmpeg version 8.1.2 Copyright ( c ) 2000-2026 the FFmpeg developers $ ffmpeg -hide_banner -encoders | grep vulkan V....D av1_vulkan AV1 ( Vulkan ) ( codec av1 ) If av1_vulkan doesn't appear, your build wasn't compiled with --enable-vulkan (distro packages vary; the BtbN static builds and most 8.x distro packages include it). 2. Probe the driver for AV1 encode 🔍 The encoder existing in FFmpeg means nothing if the driver doesn't expose the extension. This is the step that separates "should work" from "works": $ vulkaninfo | grep -iE "video_encode_(av1|queue)" VK_KHR_video_encode_av1 : extension revision 1 VK_KHR_video_encode_queue : extension revision 12 You see Meaning Both extensions listed You can encode AV1 via Vulkan 🎉 Only video_encode_queue Driver does Vulkan encode, but not AV1 (maybe H.264/H.265 only) Neither Driver too old, or GPU lacks an AV1-capable video engine Rough hardware floor: the

2026-07-08 原文 →
AI 资讯

Ship a 'Go Live' button: OBS in, LL-HLS out, webhooks in between

TL;DR We're adding live streaming to a SaaS dashboard: a backend endpoint that creates a stream, OBS as the broadcaster over RTMPS, LL-HLS playback with hls.js, and a webhook handler that keeps the UI honest. Working "go live" flow in an afternoon. 📦 Code: github.com/USER/repo (replace before publishing) Webinars, coaching sessions, company town halls: sooner or later your product gets the "can users go live?" ticket. The hard parts (ingest servers, transcoding, CDN delivery) are exactly the parts you should not build. We'll use FastPix as the managed layer here; the same flow works nearly line-for-line on Mux, Cloudflare Stream, or api.video. What we're building: A backend endpoint that creates a live stream and returns a stream key An OBS setup broadcasters can follow in two minutes A viewer page playing LL-HLS with hls.js A webhook handler that flips the webinar between scheduled → live → ended 1. Create the stream server-side 🛠️ You need API credentials (Access Token ID + Secret Key). FastPix uses Basic auth on the server API. Node 20.x, plain fetch , no SDK required (though official Node.js/Python/Go/Ruby/PHP/Java/C# SDKs exist if you prefer). // server/routes/streams.js import { Router } from " express " ; const router = Router (); const AUTH = " Basic " + Buffer . from ( ` ${ process . env . FP_TOKEN_ID } : ${ process . env . FP_SECRET } ` ). toString ( " base64 " ); router . post ( " /webinars/:id/stream " , async ( req , res ) => { const r = await fetch ( " https://api.fastpix.io/v1/live/streams " , { method : " POST " , headers : { " Content-Type " : " application/json " , Authorization : AUTH }, body : JSON . stringify ({ playbackSettings : { accessPolicy : " public " }, }), }); if ( ! r . ok ) return res . status ( 502 ). json ({ error : " stream create failed " }); const stream = await r . json (); // persist against your webinar row: // streamId, streamKey (SECRET!), playbackId await db . webinar . update ( req . params . id , { streamId : stream . str

2026-07-08 原文 →
AI 资讯

Part 1 — Container hoá app & chạy trong Kubernetes local

Bạn sẽ học gì Sau bài này, bạn sẽ tự tay đưa một app từ số 0 (một thư mục trống) đến chạy được bên trong một cluster Kubernetes chạy trên máy của bạn . Cụ thể: Viết một app Todo API nhỏ bằng Node.js + Express. Đóng gói (container hoá) nó thành một Docker image. Tạo một cluster Kubernetes local bằng kind . Deploy app bằng file YAML "thật" (không dùng lệnh tắt) để hiểu Kubernetes vận hành thế nào. Truy cập app đang chạy trong cluster từ máy của bạn. Đây là Part 1 trong series "DevOps 101 — Học K8s, Helm, ArgoCD từ số 0" . Cả series dùng chung một app tên todo-ops , các part sau sẽ xây tiếp lên nền này (thêm database, config, ingress, Helm, GitOps với ArgoCD). Điều kiện tiên quyết Docker (hoặc Docker Desktop / OrbStack) — đang chạy. kind — công cụ tạo cluster Kubernetes trong Docker. kubectl — CLI để nói chuyện với Kubernetes. Node.js 20+ và npm — để chạy thử app local. git — để quản lý mã nguồn. Cài đặt Chọn theo hệ điều hành của bạn. macOS (dùng Homebrew — nếu chưa có, cài trước): # Cài Homebrew (bỏ qua nếu đã có) /bin/bash -c " $( curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh ) " # Docker Desktop (hoặc OrbStack: brew install --cask orbstack) brew install --cask docker # Các CLI còn lại brew install kind kubectl node git Sau khi cài xong, mở Docker Desktop (hoặc OrbStack) và chờ nó báo Running trước khi chạy tiếp. Linux (Ubuntu/Debian): # Docker Engine curl -fsSL https://get.docker.com | sh sudo usermod -aG docker " $USER " # cho phép chạy docker không cần sudo (đăng xuất/đăng nhập lại để có hiệu lực) # kubectl curl -LO "https://dl.k8s.io/release/ $( curl -Ls https://dl.k8s.io/release/stable.txt ) /bin/linux/amd64/kubectl" sudo install -m 0755 kubectl /usr/local/bin/kubectl && rm kubectl # kind curl -Lo ./kind https://kind.sigs.k8s.io/dl/latest/kind-linux-amd64 sudo install -m 0755 kind /usr/local/bin/kind && rm kind # Node.js 20 (qua NodeSource) + git curl -fsSL https://deb.nodesource.com/setup_20.x | sudo -E bash - sudo apt-get insta

2026-07-08 原文 →
AI 资讯

The Turborepo + Bun + Biome stack behind a 40-package monorepo

Forty packages, one maintainer, and no ESLint config anywhere in the repo. That is not a boast - it is the direct result of a decision made early: every tool in the toolchain has to earn its place by governing all forty packages from one config file, not forty. The repo is flare-engine , a modular 2D engine for React Native + Web (animation, gamification, interactive UI, with games as showcases - not a game engine, not a Unity or Godot competitor). The stack behind it is Turborepo Bun Biome , and this post is the actual setup: the real turbo.json , the real biome.json , the real CI guardrail, straight from the repo (trimmed only where a config is long, and I say so where I trim), not a starter template's idealized version. Four binaries, four root configs - turbo.json , biome.json , tsconfig.base.json , and the Changesets config - each governing all forty packages at once (Bun's own "config" is just the workspaces array in the root package.json ). Plus a CI step that fails the build the moment a package imports something it shouldn't. That is the whole story, and I want to show you the files, not describe them. Four binaries, not twelve config files The thesis is narrow: a solo maintainer can keep forty packages honest only if there is exactly one config of each kind, and every package extends it rather than declaring its own variant. Twelve packages each with a slightly different ESLint config is not a monorepo, it is twelve monorepos wearing a workspace file as a costume. Here is the root package.json that runs all of it - Bun workspaces (not pnpm; that distinction matters and I will say it again below), the script table every package leans on, and the pinned package manager: // C:\_PROG\flare-engine-workspace\flare-engine\package.json { "name" : "flare-engine" , "version" : "0.0.0" , "private" : true , "workspaces" : [ "packages/*" , "benchmarks" , "apps/*" ], "scripts" : { "build" : "turbo build" , "test" : "turbo test" , "lint" : "turbo lint" , "typecheck" : "t

2026-07-08 原文 →
AI 资讯

A pending-plugin-count badge on the 🔌 button — reusing the dashboard cache instead of doubling state

A client asked: " After I run a cross-site update check, can each site show — right in the site list — how many plugin updates are still pending? " Visually the answer was obvious: a small red badge on the top-right of the 🔌 plugins button, like an unread-notification count. Easy to specify. The harder question was where the data comes from . We could have added a fresh API endpoint and a new cache to hold "pending count per site." But doing that would have doubled state management , and we already had a cache that knew this. We routed through the existing one. Here's the reasoning behind that decision. Reuse the dashboard cache as the data source The cross-site updates dashboard (the one we wrote about in killing the 24.5-second silence with a cache-first design ) already kept each site's pending plugins in a localStorage-backed state called _updatesDashState . Its shape: _updatesDashState = { sites : [ { site_id : " abc... " , plugins : [ {...}, {...}, {...} ] }, { site_id : " def... " , plugins : [ ... ] }, ], total_pending_count : 12 , loadedAt : 1748600000000 , } Look up by site_id , take plugins.length , and you have the badge's number. No new API, no new cache. The data that powers the cross-site dashboard is also the data that powers the site-list badge. The win of not adding state is quiet but real: When a maintenance run invalidates _updatesDashState , the badge disappears automatically (no sync code to write) The TTL (originally 7 days; later extended to 30 days with partial invalidation ) inherits from the existing design The badge and the underlying count can't drift — there's no second copy to fall out of step There's always a temptation to spin up a new endpoint for a new UI element. The rule we settled on: if the existing state answers it, don't add more. Attaching the badge — consolidate into helpers Both the list view and grid view need the same badge on the 🔌 button, so the logic lives in helpers. function _getPendingPluginCountForSite ( siteId )

2026-07-08 原文 →
AI 资讯

Your AI Can Do More Than Talk — Here's How to Make It Actually Work for You

You asked your AI to help you plan a trip. It gave you a paragraph about packing layers and booking early. You needed a checklist, a hotel shortlist, a flight window, and a rough daily schedule. What you got was a thoughtful non-answer dressed up as advice. That gap — between what AI tells you and what it could actually do for you — is the gap agentic AI is designed to close. And most people don't know it exists. The Difference Between Answering and Acting Standard AI models are trained to respond. You send a prompt, they generate a reply. The entire interaction lives inside a single text exchange. Agentic AI operates differently. Instead of producing one answer, it takes a goal and breaks it into a sequence of steps — then executes them, one after another, checking its own output along the way. It can look things up, organize information, write to a document, revisit a step if something doesn't look right, and deliver a final result that's actually usable. The travel example makes this concrete. A conversational model tells you to pack a rain jacket. An agentic setup builds you the trip: it pulls destination weather data, generates a packing list specific to your travel dates, identifies hotels in your price range, and drops everything into a structured itinerary. Same goal. Completely different level of output. Author's note: The word "agentic" has been overloaded to the point of meaninglessness in tech marketing. For our purposes here, it means one specific thing — an AI that runs a loop: think, act, observe the result, decide the next action. If it's not doing all four of those things in sequence, it's not really an agent. It's just a chatbot with extra steps. Why This Loop Changes Everything The reason agentic AI feels qualitatively different isn't magic — it's architecture. The core mechanic comes from a framework called ReAct (short for Reasoning and Acting), introduced in a 2023 paper by Yao et al. and now foundational to most production agent systems. The l

2026-07-08 原文 →
AI 资讯

How to Use Stream Analyzers for Digital TV Broadcasting: A Practical Guide

Part 1: Solving GOP Structure and Compatibility Issues Operating a digital television network isn't just about keeping channels on air—it's about maintaining quality that viewers expect and troubleshooting issues before they escalate. When something goes wrong in live broadcasting, every second counts. But how do you quickly pinpoint whether the problem lies in encoder settings, transport stream structure, or temporal metadata? This is where specialized stream analysis tools become essential. In this series of articles, we'll walk through real-world scenarios that broadcast engineers face daily and show practical approaches to diagnosing and resolving them. When File Analysis Becomes Critical While live monitoring catches issues as they happen, file-based analysis is your diagnostic microscope. Here's the typical workflow: something breaks in production, engineers capture a few minutes of the problematic stream, and now they need to understand exactly what went wrong. File analyzers serve three primary purposes: Troubleshooting: Identifying the root cause of broadcast issues Encoder optimization: Fine-tuning compression settings Quality control: Validating compliance with standards and specifications Let's explore how this works in practice with actual tools and techniques. The GOP Structure Problem Here's a scenario every broadcast engineer has encountered: legacy set-top boxes or older TV models suddenly can't play your stream. The audio works, video starts and stops, or you see freezing. The culprit? Often, it's the GOP (Group of Pictures) structure. H.264 has been around since 2003—over 20 years. Almost everything supports it, yet you'll still find legacy equipment that struggles with certain configurations. Specifically, the number of B-frames can make or break compatibility. Why B-frames matter: They enable lower bitrates while maintaining quality by increasing encoding complexity through bidirectional prediction. But this comes at a cost—a more complex refere

2026-07-07 原文 →
开发者

How to Monitor Website Changes Automatically (Visual Diff Tutorial)

How to Monitor Website Changes Automatically I run a few websites and need to know immediately when something breaks. A CSS regression, a broken layout, a missing section. Manual checking doesn't scale, and text-based monitoring misses visual issues. The {{screenshot-diff}} on Apify takes two screenshots and produces a pixel-level comparison with an overlay showing exactly what changed. How It Works Take a baseline screenshot of the correct state. Then take a current screenshot of the live page. The actor compares pixel by pixel and returns a diff image with changed pixels highlighted, plus a percentage telling you how much changed. import requests , time API_TOKEN = " YOUR_APIFY_TOKEN " def capture_screenshot ( url ): resp = requests . post ( " https://api.apify.com/v2/acts/weeknds~website-screenshot-api/runs " , headers = { " Authorization " : f " Bearer { API_TOKEN } " }, json = { " url " : url , " fullPage " : True } ) run_id = resp . json ()[ " data " ][ " id " ] time . sleep ( 15 ) items = requests . get ( f " https://api.apify.com/v2/acts/weeknds~website-screenshot-api/runs/ { run_id } /dataset/items " , headers = { " Authorization " : f " Bearer { API_TOKEN } " } ). json () return items [ 0 ][ " screenshotUrl " ] def compare_screenshots ( baseline_url , current_url ): resp = requests . post ( " https://api.apify.com/v2/acts/weeknds~screenshot-comparison-tool/runs " , headers = { " Authorization " : f " Bearer { API_TOKEN } " }, json = { " baselineImageUrl " : baseline_url , " currentImageUrl " : current_url , " threshold " : 0.01 } ) run_id = resp . json ()[ " data " ][ " id " ] time . sleep ( 10 ) items = requests . get ( f " https://api.apify.com/v2/acts/weeknds~screenshot-comparison-tool/runs/ { run_id } /dataset/items " , headers = { " Authorization " : f " Bearer { API_TOKEN } " } ). json () return items [ 0 ] baseline = capture_screenshot ( " https://mysite.com " ) current = capture_screenshot ( " https://mysite.com " ) result = compare_screenshots ( b

2026-07-07 原文 →